[Stoves] [Gasification] Heating/thermal usage - Chinaworkshopnotes

[Kevin Chisholm]

Dear Andrew

If I understand this correctly, in order to have a T-LUD  stove that could 
operate continuously,

1: One would need a mechanism or feeding system which fed in fuel counter to 
gravity, so that unburned char overflowed the edge of the reaction zone.

2: Char would not be burned in the course of normal operation, but would be 
a left over product from the T-LUD operation.

Would not a "Bottom Lit Down Draft", BLDD, be a superior way to go?

1: Fuel feed would be by gravity, eliminating the need for a feeding system 
that fed fuel "uphill."

2: There would be no left over char at the end of the day.

3: Fuel gas could be delivered to more than one burner, at some significant 
distance. (No need to take biomass fuel into the kitchen/cooking area.

4: In the case of a stove with multiple burners, each burner could be turned 
on or off as required, like a conventional natural gas stove, to save fuel.

5: Continuous operation would be very easy

Paul, as a strong advocate of T-LUD systems, perhaps you could comment on 
the advantages of the T-LUD system, and how it could be operated on a 
continuous basis? Why would you feel that a T-LUD system is better than a 
BLUD system?

Thanks.

Kevin

----- Original Message ----- 
From: "AJH" <list at sylva.icuklive.co.uk>
To: <STOVES at LISTSERV.REPP.ORG>
Sent: Sunday, August 06, 2006 4:29 PM
Subject: Re: [Stoves] [Gasification] Heating/thermal usage - 
Chinaworkshopnotes


> On Sun, 6 Aug 2006 15:03:27 -0300, Kevin Chisholm wrote:
>
>>Would someone be able to explain how a device that was started up as a 
>>T-LUD
>>could be operated on a continuous basis as a T-LUD?
>
> One of the properties of the TLUD stove is that with a given fuel
> supply the pyrolysis front descends at a fairly constant rate and
> produces offgas at a fairly constant rate, subject to the resistance
> to gases in the bed. So like an updraught co-current fuel feed such as
> were used in adaptations to some steam trains, a feed mechanism
> producing a "molehill" through which the primary air is also
> delivered,  then the rate of descent of the pyrolysis could be matched
> by a fuel feed pushing the fuel up. As long as the char spilling over
> were not exposed to any secondary air it would be preserved. The
> offgas effectively shielding it. This offgas then being burnt off
> subsequently.
>
> In fact, as the progress of the pyrolysis front is somewhat dependant
> on moisture content of the wood you could operate the thing as an
> updraught char burning gasifier.
>
> AJH
>
> _______________________________________________
> Stoves mailing list
> Stoves at listserv.repp.org
> http://listserv.repp.org/mailman/listinfo/stoves_listserv.repp.org